What is Dry Ice? / Mr. Denjiro's Happy Energy!

DENJIRO: You can easily get dry ice at a supermarket. But do you know what dry ice is actually made of?
GIRL: Um... What was it made of?
DENJIRO: Here’s a way to find out. I have some limewater here. I’m going to put a piece of dry ice inside it. What will happen? The limewater became white. Limewater turns white when it reacts with carbon dioxide. To prove this, I’m going to use a straw to blow air, which contains carbon dioxide, into limewater. Once again, it turns white. So, dry ice is actually carbon dioxide frozen into a solid state at around -80 degrees Celsius.
Let's use dry ice to do an interesting experiment. I've made a hole in the dry ice. I will insert a lit candle in here. Once it's inside, the light dies out. The hole is filled with carbon dioxide that has turned gaseous, and since there's no oxygen that is necessary for combustion, the candlelight goes out. Carbon dioxide puts out fire, but when we use a certain substance, something interesting happens. That certain substance is magnesium. We'll pour magnesium into the hole and directly light it on fire. What will happen?
GIRL: It's burning! But how?
DENJIRO: Even after covering it with dry ice, the magnesium continues to burn inside. How can it burn so violently in carbon dioxide?
Carbon dioxide is made of carbon and oxygen. On the other hand, magnesium bonds easily with oxygen. Magnesium strips away the oxygen from the carbon dioxide as it burns.
When we look at the burnt magnesium, we see black residue. This is the carbon that remains after oxygen has been stripped away from the carbon dioxide.
I hope energy will bring you all happiness. Our magic word is "Happy Energy!"